18303731493 has 8 divisors (see below), whose sum is σ = 24641917248. Its totient is φ = 12084016704.

The previous prime is 18303731473. The next prime is 18303731521. The reversal of 18303731493 is 39413730381.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 18303731493 - 2⁶ = 18303731429 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18303731473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29617380 + ... + 29617997.

It is an arithmetic number, because the mean of its divisors is an integer number (3080239656).

Almost surely, 2^18303731493 is an apocalyptic number.

It is an amenable number.

18303731493 is a deficient number, since it is larger than the sum of its proper divisors (6338185755).

18303731493 is a wasteful number, since it uses less digits than its factorization.

18303731493 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59235483.

The product of its (nonzero) digits is 163296, while the sum is 42.

The spelling of 18303731493 in words is "eighteen billion, three hundred three million, seven hundred thirty-one thousand, four hundred ninety-three".